The climate control is powered by the car's battery pack only. If it is plugged it it will also start to charge, but there is no direct connection between the EVSE and the climate control. This means that if the EVSE supplies less power than the climate control uses, there will be a net loss of charge even with the car plugged in and charging.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.